Drill steel retainer



Jan. 5 1932. J HAFFQRD 1,839,963

DRILL STEEL RETAINER Filed Feb. 25, 1928 a and CH LALI Patented Jan. 5,1 932 UNITED STATES mamo n ea DANIEL J. HAFFOR-D, OF CLEVELAND, orno,ssi'enearo noon "DR-ILL COMPANY, or onnvjnthiib, nro

DRILL screen em-am;

The present invention is directed to improvements in drill steelretainers.

The primary object ofthe invention is to provide a device of thischaracter so constructed that the drill steel will be effectively heldin its operative position when the drill is operating, the constructionbeing such that the steel can be easily and quickly removed andreplaced.

Another object of theinvention is to provide a device of this kindwherein the retainer will be prevented from swinging open when the drillsteel collar encounters the same, thus holding the drill steel againstaccidental disengagement from the front head.

Another object of the invention is to provide a device of this characterwhich is extremely simple in construction, and one wherein when thedrill steelcollar strikes the retainer the shock incident thereto willbe absorbed, thus prolonging the life of the retainer.

In the accompanying drawings:

Fig. 1 is an elevational view of the front head of a drill having theimproved retainer attached thereto, part being broken away to moreclearly show the construction;

Fig. 2 is a sectional View taken on a plane indicated by the line 2-2 inFig. 1;

Fig. 3 is a detail elevational View; and

Fig. 4 is a sectional view taken on a plane indicated by the line 4-4 inFig. 1.

Referring to the drawings, 1 designates the front head of a percussivedrill and from one side thereof projects a lug 2, said lug having anopening 3 formed therein. The front head as usual is constructed toreceive the drill steel 4, which in this instance is provided with acollar 5.

The under surface of the lug is provided with a short rib 6, the purposeof which will be later explained. Slidable in the opening 3 is a shank7, which is threaded for the application of the clamping nut 8, andencircling said shank is a coil spring 9, one end of which bears againstthe nut while the other end engages the adjacent face of the lug 2.

The shank has its lower end terminating in a head 10, said head having avertically disposed slot 11 formed therein and communie eating withanangularly disposed entrance opening 12. In this manner a hook 123 ispio= vided which serves to pivotally. connect the steel retainer perfseto the front head for operation.

,The retainer 14 consists of angularly dis= posed sections 15 and 16,the latter'having a slot 17 formed'therei'n which communicates with anopening 18 formed in the section '15, said opening being of suchdiameter thatthe collar of the drill steel may pass therethrough,whereas the slot is of such size as to arrest the movement of saidcollar.

The section is provided with an extension 19, which is arranged tonon-rotatably engage in'th'e lower end of the slot 11 below the entranceopening 12, as shown in full lines in Fig. 1.; The extension 19 isdisposed atsuch an. angle :to the section 15 as to hold theretaineragainstswinging movement with the slot 17 engaging about the drill steelshank. 1 The retainermay be pivoted to the position shown in dottedlines in Fig. 1 by raising the same: vertically until the extension 19clears'the hook 13. r

In order to prevent the head 10 from turning the upper surface thereofhas a recess 21 formed therein and in which the rib 6 en gages. It willbe of course obvious that the spring 9'willyieldably hold the headengaged with the lug 2.

'As shown in full lines in Figure 1, the extension 19 is engaged withthe hook or in the lower end of the slot 11, thus holding the retainerin a position to maintain its slot 17 engaged with the drill steel 4,and owing to the fact that this slot is of less diameter than the collar5 passage thereof through said slot is prevented. Since the extension 19fits snugly in the lower end of the slot 11 the drill steel can bepulled from a hole when stuck, owing tothe fact that whenthe re-' shockimparted to the retainer will be absorbed by the spring 9, which alsoserves to maintain the rib 6 engaged in the recess 21, therebypreventing the head from rotating. In this manner the head will be atall times held in proper relationship with respect to the drill steel.

What is claimed is 1. The combination with the fronthead of a drill, ofa lug carried thereby, a shank enlgl'aged in the lug and having a head,said ead having a longitudinal slot formed thereinvforming a hook, adrill steel retainer comprising angularly disposed sections providedwith a communicating opening and slot, a collared drill steeloperatively connected with the fronthead, one of the sections having anextension for non-rotatable engagement with the bill of the hook tomaintain the said slot in the path of movement of the drill steelcollar, and releasable therefrom to permit the opening to be positionedto permit the passage of the collar therethrough.

2. The combination with the fronthead of a drill, a lug carried thereby,a shank yieldably maintalned in the lug, said shank having a headprovided with a longitudinal slot and entrance opening communicatingwith the slot, a drill steel having a collar operatively connected withthe fronthead, a drill steel retainer including angularly disposedsections provided, respectively, with a slot and an opening, one of thesections having an angularly disposed extension carried thereby forpassage through the entrance opening for non-rotatably engaging in thelower end of the first named slot to hold the retainer in a position toprevent passage of the collar through the slot of the retainer.

In testimony whereof I aifix my signature.

DANIEL J. HAFFORD.

